cheap conversion kits?

I have started my single speed project using my 10 year old hardtail. My goal was to do it as cheap as possible as soon as possible. I bought a new crank set off Ebay for $14 (my old crank was destroyed). I was going to buy the Nashbar conversion kit $19 that includes spacers, 3 cogs and a tensioner.

I went to buy it today and the price was raised to $29.

Does anyone know if this item goes on sale often?

Is there another cheap single speed kit like the one in the link below from another store?

no conversion kit

Dude, you may not even need a conversion kit. If you have time and patience on your hands, you can probably find a ratio and chain length that will give you perfect tension-yes, even with vert dropouts-without all the hassle and expense of a tensioner. plus, it looks so much cleaner. If you're having problems with that, try a half link.

it works

I bought the nashbar conversion kit to breed new life into my friends old bike.
It works fine and has taken some beatings on long rides. Is their 10% off code finished?
W204 - think it finishes mid month.